CHAPTER 24
Configuring Layer 2 Bridging and Q-in-Q
Tunneling
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Layer 2 Bridge Domains on ACX Series Overview on page 755
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Layer 2 Learning and Forwarding for Bridge Domains Overview on page 759
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Configuring a Bridge Domain on ACX Series Routers on page 760
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Configuring Integrated Routing and Bridging in ACX Series on page 761
•
Configuring VLAN Identifiers for Bridge Domains in ACX Series on page 764
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Disabling MAC Learning for Bridge Domains on ACX Series on page 765
•
Configuring Static MAC Addresses for Logical Interfaces in a Bridge Domain in ACX
Series on page 766
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Configuring the Size of the MAC Address Table for Bridge Domains in ACX
Series on page 766
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Configuring MAC Address Limits on a Logical Interface on page 767
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Preventing Communication Among Customer Edge Devices as ACX Routers on page 770
•
Q-in-Q Tunneling on ACX Series Overview on page 770
•
Configuring Q-in-Q Tunneling on ACX Series on page 771
Layer 2 Bridge Domains on ACX Series Overview
A bridge domain is a set of logical interfaces that share the same flooding or broadcast
characteristics. Layer 2 logical interfaces are created by defining one or more logical units
on a physical interface with encapsulation as ethernet-bridge or vlan-bridge. All the
member ports of the bridge domain participate in Layer 2 learning and forwarding. You
can configure one or more bridge domains on ACX Series routers to perform Layer 2
bridging. The Layer 2 bridging functions of ACX Series routers include integrated routing
and bridging (IRB) support for Layer 2 bridging and Layer 3 IP routing on the same
interface. IRB enables you to route packets to another routed interface or to another
bridge domain that has a Layer 3 protocol configured
NOTE: ACX Series routers do not support the creation of bridge domains by
using access and trunk ports.
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